These are most likely to be in measures of inattention, inhibition interference control , nonverbal and verbal working memory, and design fluency. The problem here is the supposition that EF tests are the gold standard for evaluating EF. The fact that some prior studies have reported a mean age of onset of initial ADHD symptoms as occurring between ages 3 to 4-years-old does not automatically argue for inclusion of a precise age of onset criterion into a diagnostic system for ADHD; it only suggests that ADHD, like retardation, appears to be "developmental," arising early in many cases. You may be exposed if you are applying 2,4-D and you get it on your skin, breathe it in, or eat or smoke afterwards without washing your hands. Retrieved December 22, ADHD in adults [A manual and videotape].